dwm 6.8 stickyfullscreen patch

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+# stickyfullscreen
+
+## Description
+
+This patch keeps a client fullscreen until the user drops it. It applies to
+dwm 6.8.
+
+Many games clear `_NET_WM_STATE_FULLSCREEN` themselves when they lose focus,
+so switching tags or moving the pointer leaves the window tiled or windowed.
+With this patch a clear that arrives while the client is not the selected
+client is ignored, and `focus()` restores the fullscreen geometry when the
+client is focused again. A clear from the focused client is still honoured, so
+the game's own exit or Alt+Enter works as before.
+
+## Configuration
+
+The patch uses the existing `lockfullscreen` option in `config.h`. Set it to
+0 to disable the behaviour. No new options are added.
+
+## Testing
+
+Applies and builds against dwm 6.8. Runtime tested under Xvfb: a fullscreen
+clear sent while unfocused is ignored, and the same clear while focused is
+honoured.
+
+## Download
+
+* [dwm-stickyfullscreen-6.8.diff](dwm-stickyfullscreen-6.8.diff)
+
+## Author
+
+* Daniel Guihot - [daniel@guihot.net](mailto:daniel@guihot.net)